remove shared/join

Author: Syed Aslam

Diff for: library/set/join_spec.rb

@@ -1,5 +1,4 @@
 require_relative '../../spec_helper'
-require_relative 'shared/join'
 require 'set'
 
 ruby_version_is "3.0" do
@@ -8,6 +7,25 @@
       Set[].join.should == ''
     end
 
-    it_behaves_like :set_join, :join
+    it "returns a new string formed by joining elements after conversion" do
+      set = Set[:a, :b, :c]
+      set.join.should == "abc"
+    end
+
+    it "does not separate elements when the passed separator is nil" do
+      set = Set[:a, :b, :c]
+      set.join(nil).should == "abc"
+    end
+
+    it "returns a string formed by concatenating each element separated by the separator" do
+      set = Set[:a, :b, :c]
+      set.join(' | ').should == "a | b | c"
+    end
+
+    it "calls #to_a to convert the Set in to an Array" do
+      set = Set[:a, :b, :c]
+      set.should_receive(:to_a).and_return([:a, :b, :c])
+      set.join.should == "abc"
+    end
   end
 end